Molecular dynamic computer simulations were performed to study the mass dependence of mutual diffusion coefficient in an isotopic, equimolar binary system. The particles of the system were assumed to be interacting via Lennard-Jones potential. The self- and mutual diffusion coefficients were calculated from the time dependence of the mean square displacement and from the velocity correlation function using the Green–Kubo formula. The study was carried out at different densities and temperatures. Like the self-diffusion coefficient, the mutual diffusion coefficient was also found to be weakly dependent upon the mass ratio. The study also showed that the temperature of the system had a negligible effect upon the mass dependence of the diffusion coefficients.

Mass Dependence of Mutual Diffusion Coefficient: Computer Simulation Study. R.Sharma, K.Tankeshwar,  S.Ranganathan: Physics and Chemistry of Liquids, 2011, 49[2], 206-18